Update C/C++ demos to latest upstream API
[ldk-c-bindings] / lightning-c-bindings / demo.cpp
index 06be77f3504885495f41f3429b996a8d7d2c1b7c..1d29ed60293b96ca7789edc3e20b5f1e96320c9f 100644 (file)
@@ -98,8 +98,10 @@ const LDKThirtyTwoBytes genesis_hash = { // We don't care particularly if this i
        .data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1 }
 };
 
-void print_log(const void *this_arg, const char *record) {
-       printf("%p - %s\n", this_arg, record);
+void print_log(const void *this_arg, const LDKRecord *record) {
+       LDK::Str mod = Record_get_module_path(record);
+       LDK::Str str = Record_get_args(record);
+       printf("%p - %.*s:%d - %.*s\n", this_arg, (int)mod->len, mod->chars, Record_get_line(record), (int)str->len, str->chars);
 }
 
 uint32_t get_fee(const void *this_arg, LDKConfirmationTarget target) {
@@ -165,7 +167,7 @@ LDKCResult_NoneChannelMonitorUpdateErrZ update_channel_monitor(const void *this_
                        LDKBroadcasterInterface broadcaster = {
                                .broadcast_transaction = broadcast_tx,
                        };
-                       LDK::CResult_NoneMonitorUpdateErrorZ res = ChannelMonitor_update_monitor(&mon.second, &update, &broadcaster, &fee_est, arg->logger);
+                       LDK::CResult_NoneNoneZ res = ChannelMonitor_update_monitor(&mon.second, &update, &broadcaster, &fee_est, arg->logger);
                        assert(res->result_ok);
                }
        }
@@ -174,12 +176,12 @@ LDKCResult_NoneChannelMonitorUpdateErrZ update_channel_monitor(const void *this_
        mons_updated += 1;
        return CResult_NoneChannelMonitorUpdateErrZ_ok();
 }
-LDKCVec_MonitorEventZ monitors_pending_monitor_events(const void *this_arg) {
+LDKCVec_C2Tuple_OutPointCVec_MonitorEventZZZ monitors_pending_monitor_events(const void *this_arg) {
        NodeMonitors* arg = (NodeMonitors*) this_arg;
        std::unique_lock<std::mutex> l(arg->mut);
 
        if (arg->mons.size() == 0) {
-               return LDKCVec_MonitorEventZ {
+               return LDKCVec_C2Tuple_OutPointCVec_MonitorEventZZZ {
                        .data = NULL,
                        .datalen = 0,
                };
@@ -187,16 +189,25 @@ LDKCVec_MonitorEventZ monitors_pending_monitor_events(const void *this_arg) {
                // We only ever actually have one channel per node, plus concatenating two
                // Rust Vecs to each other from C++ will require a bit of effort.
                assert(arg->mons.size() == 1);
-               return ChannelMonitor_get_and_clear_pending_monitor_events(&arg->mons[0].second);
+               LDK::CVec_MonitorEventZ events = ChannelMonitor_get_and_clear_pending_monitor_events(&arg->mons[0].second);
+               LDK::C2Tuple_OutPointScriptZ funding_info = ChannelMonitor_get_funding_txo(&arg->mons[0].second);
+               LDK::OutPoint outpoint = std::move(funding_info->a);
+               LDK::C2Tuple_OutPointCVec_MonitorEventZZ pair = C2Tuple_OutPointCVec_MonitorEventZZ_new(std::move(outpoint), std::move(events));
+               auto vec = LDKCVec_C2Tuple_OutPointCVec_MonitorEventZZZ {
+                       .data = (LDKC2Tuple_OutPointCVec_MonitorEventZZ*)malloc(sizeof(LDKC2Tuple_OutPointCVec_MonitorEventZZ)),
+                       .datalen = 1,
+               };
+               vec.data[0] = std::move(pair);
+               return vec;
        }
 }
 
 struct EventQueue {
        std::vector<LDK::Event> events;
 };
-void handle_event(const void *this_arg, LDKEvent event) {
+void handle_event(const void *this_arg, const LDKEvent *event) {
        EventQueue* arg = (EventQueue*) this_arg;
-       arg->events.push_back(std::move(event));
+       arg->events.push_back(Event_clone(event));
 }
 
 #ifdef REAL_NET
@@ -242,6 +253,9 @@ public:
                        if (peers_1->datalen == 0 && peers_2->datalen == 0) { break; }
                        std::this_thread::yield();
                }
+               // Note that the above is somewhat race-y, as node 2 may still think its connected.
+               // Thus, make sure any connections are disconnected on its end as well.
+               PeerManager_disconnect_by_node_id(&net2, ChannelManager_get_our_node_id(&cm1), false);
 
                // Finally make an actual connection and keep it this time
                assert(!socket_connect(node1_handler, ChannelManager_get_our_node_id(&cm2), (sockaddr*)&listen_addr, sizeof(listen_addr)));
@@ -308,7 +322,7 @@ public:
                        .disconnect_socket = sock_disconnect_socket,
                        .eq = sock_eq,
                        .hash = sock_hash,
-                       .clone = NULL,
+                       .cloned = NULL,
                        .free = NULL,
                };
 
@@ -318,7 +332,7 @@ public:
                        .disconnect_socket = sock_disconnect_socket,
                        .eq = sock_eq,
                        .hash = sock_hash,
-                       .clone = NULL,
+                       .cloned = NULL,
                        .free = NULL,
                };
 
@@ -326,9 +340,9 @@ public:
                t2 = std::thread(&sock_read_data_thread, pipefds_1_to_2[0], &sock2, &net2);
 
                // Note that we have to bind the result to a C++ class to make sure it gets free'd
-               LDK::CResult_CVec_u8ZPeerHandleErrorZ con_res = PeerManager_new_outbound_connection(&net1, ChannelManager_get_our_node_id(&cm2), sock1);
+               LDK::CResult_CVec_u8ZPeerHandleErrorZ con_res = PeerManager_new_outbound_connection(&net1, ChannelManager_get_our_node_id(&cm2), sock1, COption_NetAddressZ_none());
                assert(con_res->result_ok);
-               LDK::CResult_NonePeerHandleErrorZ con_res2 = PeerManager_new_inbound_connection(&net2, sock2);
+               LDK::CResult_NonePeerHandleErrorZ con_res2 = PeerManager_new_inbound_connection(&net2, sock2, COption_NetAddressZ_none());
                assert(con_res2->result_ok);
 
                auto writelen = write(pipefds_1_to_2[1], con_res->contents.result->data, con_res->contents.result->datalen);
@@ -354,6 +368,86 @@ public:
 };
 #endif // !REAL_NET
 
+struct CustomMsgQueue {
+       std::vector<LDK::Type> msgs;
+};
+
+uint16_t custom_msg_type_id(const void *this_arg) {
+       return 8888;
+}
+LDKCVec_u8Z custom_msg_bytes(const void *this_arg) {
+       uint8_t *bytes = (uint8_t *) malloc(1024);
+       memset(bytes, 42, 1024);
+       return LDKCVec_u8Z {
+               .data = bytes, .datalen = 1024
+       };
+}
+LDKStr custom_msg_debug(const void *this_arg) {
+       return LDKStr {
+               .chars = NULL, .len = 0, .chars_is_owned = false
+       };
+}
+
+LDKCResult_COption_TypeZDecodeErrorZ read_custom_message(const void* this_arg, uint16_t type_id, LDKu8slice buf) {
+       assert(type_id == 8888);
+       assert(buf.datalen == 1024);
+       uint8_t cmp[1024];
+       memset(cmp, 42, 1024);
+       assert(!memcmp(cmp, buf.data, 1024));
+       return CResult_COption_TypeZDecodeErrorZ_ok(COption_TypeZ_some(LDKType {
+               .this_arg = NULL,
+               .type_id = custom_msg_type_id,
+               .debug_str = custom_msg_debug,
+               .free = NULL,
+       }));
+}
+
+LDKCResult_NoneLightningErrorZ handle_custom_message(const void* this_arg, struct LDKType msg, struct LDKPublicKey _sender_node_id) {
+       CustomMsgQueue* arg = (CustomMsgQueue*) this_arg;
+       arg->msgs.push_back(std::move(msg));
+       return CResult_NoneLightningErrorZ_ok();
+}
+LDKCVec_C2Tuple_PublicKeyTypeZZ never_send_custom_msgs(const void* this_arg) {
+       return LDKCVec_C2Tuple_PublicKeyTypeZZ {
+               .data = NULL, .datalen = 0
+       };
+}
+
+LDKCVec_C2Tuple_PublicKeyTypeZZ create_custom_msg(const void* this_arg) {
+       const LDKPublicKey *counterparty_node_id = (const LDKPublicKey *)this_arg;
+       LDKCVec_C2Tuple_PublicKeyTypeZZ ret = {
+               .data = ((LDKC2Tuple_PublicKeyTypeZ*)malloc(sizeof(LDKC2Tuple_PublicKeyTypeZ))),
+               .datalen = 1
+       };
+       ret.data[0].a = *counterparty_node_id;
+       ret.data[0].b = LDKType {
+               .this_arg = NULL,
+               .type_id = custom_msg_type_id,
+               .debug_str = custom_msg_debug,
+               .write = custom_msg_bytes,
+               .free = NULL,
+       };
+       return ret;
+}
+
+uint64_t get_chan_score(const void *this_arg, uint64_t scid, const LDKNodeId *src, const LDKNodeId *dst, LDKChannelUsage usage_in) {
+       LDK::ChannelUsage usage(std::move(usage_in));
+       return 42;
+}
+
+struct CustomRouteFinderParams {
+       LDKLogger *logger;
+       LDKNetworkGraph *graph_ref;
+       LDKThirtyTwoBytes random_seed_bytes;
+};
+struct LDKCResult_RouteLightningErrorZ custom_find_route(const void *this_arg, struct LDKPublicKey payer, const struct LDKRouteParameters *NONNULL_PTR route_params, const uint8_t (*payment_hash)[32], struct LDKCVec_ChannelDetailsZ *first_hops, const struct LDKScore *NONNULL_PTR scorer) {
+       const struct CustomRouteFinderParams *params = (struct CustomRouteFinderParams *)this_arg;
+       assert(first_hops->datalen == 1);
+       assert(ChannelDetails_get_is_usable(&first_hops->data[0]));
+       LDK::ReadOnlyNetworkGraph graph_lock = NetworkGraph_read_only(params->graph_ref);
+       return find_route(payer, route_params, &graph_lock, first_hops, *params->logger, scorer, &params->random_seed_bytes.data);
+}
+
 int main() {
        uint8_t channel_open_header[80];
        uint8_t header_1[80];
@@ -395,7 +489,8 @@ int main() {
                .free = NULL,
        };
 
-       LDK::NetGraphMsgHandler net_graph1 = NetGraphMsgHandler_new(genesis_hash, NULL, logger1);
+       LDK::NetworkGraph net_graph1 = NetworkGraph_new(genesis_hash, logger1);
+       LDK::P2PGossipSync graph_msg_handler1 = P2PGossipSync_new(&net_graph1, COption_AccessZ_none(), logger1);
        LDKSecretKey node_secret1;
 
        LDKLogger logger2 {
@@ -414,7 +509,8 @@ int main() {
                .free = NULL,
        };
 
-       LDK::NetGraphMsgHandler net_graph2 = NetGraphMsgHandler_new(genesis_hash, NULL, logger2);
+       LDK::NetworkGraph net_graph2 = NetworkGraph_new(genesis_hash, logger2);
+       LDK::P2PGossipSync graph_msg_handler2 = P2PGossipSync_new(&net_graph2, COption_AccessZ_none(), logger2);
        LDKSecretKey node_secret2;
 
        LDK::CVec_u8Z cm1_ser = LDKCVec_u8Z {}; // ChannelManager 1 serialization at the end of the ser-des scope
@@ -426,17 +522,22 @@ int main() {
                memset(&node_seed, 0, 32);
                LDK::KeysManager keys1 = KeysManager_new(&node_seed, 0, 0);
                LDK::KeysInterface keys_source1 = KeysManager_as_KeysInterface(&keys1);
-               node_secret1 = keys_source1->get_node_secret(keys_source1->this_arg);
+               LDK::CResult_SecretKeyNoneZ node_secret1_res = keys_source1->get_node_secret(keys_source1->this_arg, LDKRecipient_Node);
+               assert(node_secret1_res->result_ok);
+               node_secret1 = *node_secret1_res->contents.result;
 
                LDK::ChannelManager cm1 = ChannelManager_new(fee_est, mon1, broadcast, logger1, KeysManager_as_KeysInterface(&keys1), UserConfig_default(), ChainParameters_new(network, BestBlock_new(chain_tip, 0)));
 
                LDK::CVec_ChannelDetailsZ channels = ChannelManager_list_channels(&cm1);
                assert(channels->datalen == 0);
 
-               LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph1));
+               LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), P2PGossipSync_as_RoutingMessageHandler(&graph_msg_handler1));
+
+               LDK::IgnoringMessageHandler ignoring_handler1 = IgnoringMessageHandler_new();
+               LDK::CustomMessageHandler custom_msg_handler1 = IgnoringMessageHandler_as_CustomMessageHandler(&ignoring_handler1);
 
                random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
-               LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1);
+               LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1, std::move(custom_msg_handler1));
 
                // Demo getting a channel key and check that its returning real pubkeys:
                LDK::Sign chan_signer1 = keys_source1->get_channel_signer(keys_source1->this_arg, false, 42);
@@ -448,7 +549,9 @@ int main() {
                memset(&node_seed, 1, 32);
                LDK::KeysManager keys2 = KeysManager_new(&node_seed, 0, 0);
                LDK::KeysInterface keys_source2 = KeysManager_as_KeysInterface(&keys2);
-               node_secret2 = keys_source2->get_node_secret(keys_source2->this_arg);
+               LDK::CResult_SecretKeyNoneZ node_secret2_res = keys_source2->get_node_secret(keys_source2->this_arg, LDKRecipient_Node);
+               assert(node_secret2_res->result_ok);
+               node_secret2 = *node_secret2_res->contents.result;
 
                LDK::ChannelHandshakeConfig handshake_config2 = ChannelHandshakeConfig_default();
                ChannelHandshakeConfig_set_minimum_depth(&handshake_config2, 2);
@@ -460,7 +563,7 @@ int main() {
                LDK::CVec_ChannelDetailsZ channels2 = ChannelManager_list_channels(&cm2);
                assert(channels2->datalen == 0);
 
-               LDK::RoutingMessageHandler net_msgs2 = NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph2);
+               LDK::RoutingMessageHandler net_msgs2 = P2PGossipSync_as_RoutingMessageHandler(&graph_msg_handler2);
                LDK::CResult_ChannelAnnouncementDecodeErrorZ chan_ann = ChannelAnnouncement_read(LDKu8slice { .data = valid_node_announcement, .datalen = sizeof(valid_node_announcement) });
                assert(chan_ann->result_ok);
                LDK::CResult_boolLightningErrorZ ann_res = net_msgs2->handle_channel_announcement(net_msgs2->this_arg, chan_ann->contents.result);
@@ -468,27 +571,32 @@ int main() {
 
                LDK::MessageHandler msg_handler2 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm2), std::move(net_msgs2));
 
+               LDK::IgnoringMessageHandler ignoring_handler2 = IgnoringMessageHandler_new();
+               LDK::CustomMessageHandler custom_msg_handler2 = IgnoringMessageHandler_as_CustomMessageHandler(&ignoring_handler2);
+
                random_bytes = keys_source2->get_secure_random_bytes(keys_source2->this_arg);
-               LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2);
+               LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2, std::move(custom_msg_handler2));
 
                // Open a connection!
                PeersConnection conn(cm1, cm2, net1, net2);
 
                // Note that we have to bind the result to a C++ class to make sure it gets free'd
-               LDK::CResult_NoneAPIErrorZ res = ChannelManager_create_channel(&cm1, ChannelManager_get_our_node_id(&cm2), 40000, 1000, 42, UserConfig_default());
+               LDK::CResult__u832APIErrorZ res = ChannelManager_create_channel(&cm1, ChannelManager_get_our_node_id(&cm2), 40000, 1000, 42, UserConfig_default());
                assert(res->result_ok);
                PeerManager_process_events(&net1);
 
                LDK::CVec_ChannelDetailsZ new_channels = ChannelManager_list_channels(&cm1);
                assert(new_channels->datalen == 1);
-               LDKPublicKey chan_open_pk = ChannelDetails_get_remote_network_id(&new_channels->data[0]);
+               LDK::ChannelCounterparty new_channels_counterparty = ChannelDetails_get_counterparty(&new_channels->data[0]);
+               LDKPublicKey chan_open_pk = ChannelCounterparty_get_node_id(&new_channels_counterparty);
                assert(!memcmp(chan_open_pk.compressed_form, ChannelManager_get_our_node_id(&cm2).compressed_form, 33));
 
                while (true) {
                        LDK::CVec_ChannelDetailsZ new_channels_2 = ChannelManager_list_channels(&cm2);
                        if (new_channels_2->datalen == 1) {
                                // Sample getting our counterparty's init features (which used to be hard to do without a memory leak):
-                               const LDK::InitFeatures init_feats = ChannelDetails_get_counterparty_features(&new_channels_2->data[0]);
+                               LDK::ChannelCounterparty new_channels_2_counterparty = ChannelDetails_get_counterparty(&new_channels_2->data[0]);
+                               const LDK::InitFeatures init_feats = ChannelCounterparty_get_features(&new_channels_2_counterparty);
                                assert(init_feats->inner != NULL);
                                break;
                        }
@@ -508,7 +616,7 @@ int main() {
                                assert(!memcmp(queue.events[0]->funding_generation_ready.output_script.data, channel_open_block + 58 + 81, 34));
                                LDKTransaction funding_transaction { .data = const_cast<uint8_t*>(channel_open_block + 81), .datalen = sizeof(channel_open_block) - 81, .data_is_owned = false };
 
-                               LDK::CResult_NoneAPIErrorZ fund_res = ChannelManager_funding_transaction_generated(&cm1, &queue.events[0]->funding_generation_ready.temporary_channel_id.data, funding_transaction);
+                               LDK::CResult_NoneAPIErrorZ fund_res = ChannelManager_funding_transaction_generated(&cm1, &queue.events[0]->funding_generation_ready.temporary_channel_id.data, queue.events[0]->funding_generation_ready.counterparty_node_id, funding_transaction);
                                assert(fund_res->result_ok);
                                break;
                        }
@@ -551,21 +659,30 @@ int main() {
                PeerManager_process_events(&net2);
 
                // Now send funds from 1 to 2!
+               uint64_t channel_scid;
                while (true) {
                        LDK::CVec_ChannelDetailsZ outbound_channels = ChannelManager_list_usable_channels(&cm1);
                        if (outbound_channels->datalen == 1) {
                                const LDKChannelDetails *channel = &outbound_channels->data[0];
+                               LDK::ChannelCounterparty counterparty = ChannelDetails_get_counterparty(channel);
                                // Note that the channel ID is the same as the channel txid reversed as the output index is 0
                                uint8_t expected_chan_id[32];
                                for (int i = 0; i < 32; i++) { expected_chan_id[i] = channel_open_txid[31-i]; }
                                assert(!memcmp(ChannelDetails_get_channel_id(channel), expected_chan_id, 32));
-                               assert(!memcmp(ChannelDetails_get_remote_network_id(channel).compressed_form,
-                                               ChannelManager_get_our_node_id(&cm2).compressed_form, 33));
+                               assert(!memcmp(
+                                       ChannelCounterparty_get_node_id(&counterparty).compressed_form,
+                                       ChannelManager_get_our_node_id(&cm2).compressed_form, 33));
                                assert(ChannelDetails_get_channel_value_satoshis(channel) == 40000);
                                // We opened the channel with 1000 push_msat:
-                               assert(ChannelDetails_get_outbound_capacity_msat(channel) == 40000*1000 - 1000);
-                               assert(ChannelDetails_get_inbound_capacity_msat(channel) == 1000);
+                               assert(ChannelDetails_get_outbound_capacity_msat(channel) ==
+                                       40000*1000 - 1000 - 1000 * ChannelCounterparty_get_unspendable_punishment_reserve(&counterparty));
+                               int64_t inbound_capacity = ((int64_t)1000) - ChannelCounterparty_get_unspendable_punishment_reserve(&counterparty);
+                               if (inbound_capacity < 0) inbound_capacity = 0;
+                               assert(ChannelDetails_get_inbound_capacity_msat(channel) == (uint64_t)inbound_capacity);
                                assert(ChannelDetails_get_is_usable(channel));
+                               LDK::COption_u64Z scid_opt = ChannelDetails_get_short_channel_id(channel);
+                               assert(scid_opt->some);
+                               channel_scid = scid_opt->some;
                                break;
                        }
                        std::this_thread::yield();
@@ -582,21 +699,36 @@ int main() {
                                .chars = (const uint8_t *)"Invoice Description",
                                .len =             strlen("Invoice Description"),
                                .chars_is_owned = false
-                       });
+                       }, 3600);
                assert(invoice->result_ok);
                LDKThirtyTwoBytes payment_hash;
                memcpy(payment_hash.data, Invoice_payment_hash(invoice->contents.result), 32);
 
                {
                        LDK::CVec_ChannelDetailsZ outbound_channels = ChannelManager_list_usable_channels(&cm1);
-                       LDK::LockedNetworkGraph graph_2_locked = NetGraphMsgHandler_read_locked_graph(&net_graph2);
-                       LDK::NetworkGraph graph_2_ref = LockedNetworkGraph_graph(&graph_2_locked);
-                       LDK::CResult_RouteLightningErrorZ route = get_route(ChannelManager_get_our_node_id(&cm1), &graph_2_ref, ChannelManager_get_our_node_id(&cm2), LDKInvoiceFeatures {
-                                       .inner = NULL, .is_owned = false
-                               }, &outbound_channels, Invoice_route_hints(invoice->contents.result),
-                               5000, Invoice_min_final_cltv_expiry(invoice->contents.result), logger1);
+                       LDK::Score chan_scorer = LDKScore {
+                               .this_arg = NULL, .channel_penalty_msat = get_chan_score, .free = NULL
+                       };
+                       LDK::RouteParameters route_params = RouteParameters_new(PaymentParameters_new(
+                                       ChannelManager_get_our_node_id(&cm2), LDKInvoiceFeatures {
+                                               .inner = NULL, .is_owned = false
+                                       }, Invoice_route_hints(invoice->contents.result), COption_u64Z_none(), 0xffffffff),
+                               5000, Invoice_min_final_cltv_expiry(invoice->contents.result));
+                       random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
+                       LDK::ReadOnlyNetworkGraph graph_lock = NetworkGraph_read_only(&net_graph2);
+
+                       LDK::CResult_RouteLightningErrorZ route = find_route(ChannelManager_get_our_node_id(&cm1), &route_params, &graph_lock, &outbound_channels, logger1, &chan_scorer, &random_bytes.data);
+
                        assert(route->result_ok);
-                       LDK::CResult_NonePaymentSendFailureZ send_res = ChannelManager_send_payment(&cm1, route->contents.result, payment_hash, Invoice_payment_secret(invoice->contents.result));
+                       LDK::CVec_CVec_RouteHopZZ paths = Route_get_paths(route->contents.result);
+                       assert(paths->datalen == 1);
+                       assert(paths->data[0].datalen == 1);
+                       assert(!memcmp(RouteHop_get_pubkey(&paths->data[0].data[0]).compressed_form,
+                               ChannelManager_get_our_node_id(&cm2).compressed_form, 33));
+                       assert(RouteHop_get_short_channel_id(&paths->data[0].data[0]) == channel_scid);
+                       LDKThirtyTwoBytes payment_secret;
+                       memcpy(payment_secret.data, Invoice_payment_secret(invoice->contents.result), 32);
+                       LDK::CResult_PaymentIdPaymentSendFailureZ send_res = ChannelManager_send_payment(&cm1, route->contents.result, payment_hash, payment_secret);
                        assert(send_res->result_ok);
                }
 
@@ -607,11 +739,11 @@ int main() {
                }
 
                // Check that we received the payment!
-               LDKEventsProvider ev2 = ChannelManager_as_EventsProvider(&cm2);
+               LDK::EventsProvider ev2 = ChannelManager_as_EventsProvider(&cm2);
                while (true) {
                        EventQueue queue;
                        LDKEventHandler handler = { .this_arg = &queue, .handle_event = handle_event, .free = NULL };
-                       ev2.process_pending_events(ev2.this_arg, handler);
+                       ev2.process_pending_events(handler);
                        if (queue.events.size() == 1) {
                                assert(queue.events[0]->tag == LDKEvent_PendingHTLCsForwardable);
                                break;
@@ -626,14 +758,23 @@ int main() {
                {
                        EventQueue queue;
                        LDKEventHandler handler = { .this_arg = &queue, .handle_event = handle_event, .free = NULL };
-                       ev2.process_pending_events(ev2.this_arg, handler);
+                       ev2.process_pending_events(handler);
                        assert(queue.events.size() == 1);
                        assert(queue.events[0]->tag == LDKEvent_PaymentReceived);
                        assert(!memcmp(queue.events[0]->payment_received.payment_hash.data, payment_hash.data, 32));
-                       assert(!memcmp(queue.events[0]->payment_received.payment_secret.data, Invoice_payment_secret(invoice->contents.result).data, 32));
-                       assert(queue.events[0]->payment_received.amt == 5000);
-                       memcpy(payment_preimage.data, queue.events[0]->payment_received.payment_preimage.data, 32);
-                       assert(ChannelManager_claim_funds(&cm2, payment_preimage));
+                       assert(queue.events[0]->payment_received.purpose.tag == LDKPaymentPurpose_InvoicePayment);
+                       assert(!memcmp(queue.events[0]->payment_received.purpose.invoice_payment.payment_secret.data,
+                                       Invoice_payment_secret(invoice->contents.result), 32));
+                       assert(queue.events[0]->payment_received.amount_msat == 5000);
+                       memcpy(payment_preimage.data, queue.events[0]->payment_received.purpose.invoice_payment.payment_preimage.data, 32);
+                       ChannelManager_claim_funds(&cm2, payment_preimage);
+
+                       queue.events.clear();
+                       ev2.process_pending_events(handler);
+                       assert(queue.events.size() == 1);
+                       assert(queue.events[0]->tag == LDKEvent_PaymentClaimed);
+                       assert(!memcmp(queue.events[0]->payment_claimed.payment_hash.data, payment_hash.data, 32));
+                       assert(queue.events[0]->payment_claimed.purpose.tag == LDKPaymentPurpose_InvoicePayment);
                }
                PeerManager_process_events(&net2);
                // Wait until we've passed through a full set of monitor updates (ie new preimage + CS/RAA messages)
@@ -643,10 +784,13 @@ int main() {
                {
                        EventQueue queue;
                        LDKEventHandler handler = { .this_arg = &queue, .handle_event = handle_event, .free = NULL };
-                       ev1.process_pending_events(ev1.this_arg, handler);
-                       assert(queue.events.size() == 1);
+                       while (queue.events.size() < 2)
+                               ev1.process_pending_events(ev1.this_arg, handler);
+                       assert(queue.events.size() == 2);
                        assert(queue.events[0]->tag == LDKEvent_PaymentSent);
                        assert(!memcmp(queue.events[0]->payment_sent.payment_preimage.data, payment_preimage.data, 32));
+                       assert(queue.events[1]->tag == LDKEvent_PaymentPathSuccessful);
+                       assert(!memcmp(queue.events[1]->payment_path_successful.payment_hash.data, payment_hash.data, 32));
                }
 
                conn.stop();
@@ -686,17 +830,42 @@ int main() {
        // Attempt to close the channel...
        uint8_t chan_id[32];
        for (int i = 0; i < 32; i++) { chan_id[i] = channel_open_txid[31-i]; }
-       LDK::CResult_NoneAPIErrorZ close_res = ChannelManager_close_channel(&cm1, &chan_id);
+       LDK::CResult_NoneAPIErrorZ close_res = ChannelManager_close_channel(&cm1, &chan_id, ChannelManager_get_our_node_id(&cm2));
        assert(!close_res->result_ok); // Note that we can't close while disconnected!
 
        // Open a connection!
-       LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph1));
+       LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), P2PGossipSync_as_RoutingMessageHandler(&graph_msg_handler1));
        random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
-       LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1);
 
-       LDK::MessageHandler msg_handler2 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm2), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph2));
+       LDKPublicKey chan_2_node_id = ChannelManager_get_our_node_id(&cm2);
+       LDKCustomMessageHandler custom_msg_handler1 = {
+               .this_arg = &chan_2_node_id,
+               .handle_custom_message = NULL, // We only create custom messages, not handle them
+               .get_and_clear_pending_msg = create_custom_msg,
+               .CustomMessageReader = LDKCustomMessageReader {
+                       .this_arg = NULL,
+                       .read = read_custom_message,
+                       .free = NULL,
+               },
+               .free = NULL,
+       };
+       LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1, std::move(custom_msg_handler1));
+
+       LDK::MessageHandler msg_handler2 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm2), P2PGossipSync_as_RoutingMessageHandler(&graph_msg_handler2));
+       CustomMsgQueue peer_2_custom_messages;
+       LDKCustomMessageHandler custom_msg_handler2 = {
+               .this_arg = &peer_2_custom_messages,
+               .handle_custom_message = handle_custom_message,
+               .get_and_clear_pending_msg = never_send_custom_msgs,
+               .CustomMessageReader = LDKCustomMessageReader {
+                       .this_arg = NULL,
+                       .read = read_custom_message,
+                       .free = NULL,
+               },
+               .free = NULL,
+       };
        random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
-       LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2);
+       LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2, std::move(custom_msg_handler2));
 
        PeersConnection conn(cm1, cm2, net1, net2);
 
@@ -708,9 +877,94 @@ int main() {
                }
        }
 
+       // Send another payment, this time via the InvoicePayer
+       struct CustomRouteFinderParams router_params = {
+               .logger = &logger1,
+               .graph_ref = &net_graph1,
+               .random_seed_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg),
+       };
+       LDKRouter sending_router = {
+               .this_arg = &router_params,
+               .find_route = custom_find_route,
+               .free = NULL,
+       };
+       LDK::ProbabilisticScorer scorer = ProbabilisticScorer_new(ProbabilisticScoringParameters_default(), &net_graph1, logger1);
+       LDK::MultiThreadedLockableScore scorer_mtx = MultiThreadedLockableScore_new(ProbabilisticScorer_as_Score(&scorer));
+       EventQueue queue1;
+       LDKEventHandler handler1 = { .this_arg = &queue1, .handle_event = handle_event, .free = NULL };
+       LDK::InvoicePayer payer = InvoicePayer_new(ChannelManager_as_Payer(&cm1), sending_router, &scorer_mtx, logger1, handler1, Retry_attempts(0));
+
+       LDK::CResult_InvoiceSignOrCreationErrorZ invoice_res2 = create_invoice_from_channelmanager(&cm2,
+               KeysManager_as_KeysInterface(&keys2),
+               LDKCurrency_Bitcoin, COption_u64Z_some(10000),
+               LDKStr {
+                       .chars = (const uint8_t *)"Invoice 2 Description",
+                       .len =             strlen("Invoice 2 Description"),
+                       .chars_is_owned = false
+               }, 3600);
+       assert(invoice_res2->result_ok);
+       const LDKInvoice *invoice2 = invoice_res2->contents.result;
+       LDK::CResult_PaymentIdPaymentErrorZ invoice_pay_res = InvoicePayer_pay_invoice(&payer, invoice2);
+       assert(invoice_pay_res->result_ok);
+       PeerManager_process_events(&net1);
+
+       // Check that we received the payment!
+       while (true) {
+               EventQueue queue2;
+               LDKEventHandler handler2 = { .this_arg = &queue2, .handle_event = handle_event, .free = NULL };
+               LDK::EventsProvider ev2 = ChannelManager_as_EventsProvider(&cm2);
+               ev2.process_pending_events(handler2);
+               if (queue2.events.size() == 1) {
+                       assert(queue2.events[0]->tag == LDKEvent_PendingHTLCsForwardable);
+                       break;
+               }
+               std::this_thread::yield();
+       }
+       ChannelManager_process_pending_htlc_forwards(&cm2);
+       PeerManager_process_events(&net2);
+
+       while (true) {
+               EventQueue queue2;
+               LDKEventHandler handler2 = { .this_arg = &queue2, .handle_event = handle_event, .free = NULL };
+               LDK::EventsProvider ev2 = ChannelManager_as_EventsProvider(&cm2);
+               ev2.process_pending_events(handler2);
+               if (queue2.events.size() == 1) {
+                       assert(queue2.events[0]->tag == LDKEvent_PaymentReceived);
+                       const struct LDKEvent_LDKPaymentReceived_Body *event_data = &queue2.events[0]->payment_received;
+                       assert(!memcmp(event_data->payment_hash.data, Invoice_payment_hash(invoice2), 32));
+                       assert(event_data->purpose.tag == LDKPaymentPurpose_InvoicePayment);
+                       assert(!memcmp(event_data->purpose.invoice_payment.payment_secret.data,
+                                       Invoice_payment_secret(invoice2), 32));
+                       assert(event_data->amount_msat == 10000);
+                       ChannelManager_claim_funds(&cm2, event_data->purpose.invoice_payment.payment_preimage);
+
+                       queue2.events.clear();
+                       ev2.process_pending_events(handler2);
+                       assert(queue2.events.size() == 1);
+                       assert(queue2.events[0]->tag == LDKEvent_PaymentClaimed);
+                       assert(!memcmp(queue2.events[0]->payment_claimed.payment_hash.data, Invoice_payment_hash(invoice2), 32));
+                       assert(queue2.events[0]->payment_claimed.purpose.tag == LDKPaymentPurpose_InvoicePayment);
+
+                       break;
+               }
+               std::this_thread::yield();
+       }
+
+       while (queue1.events.size() < 2) {
+               PeerManager_process_events(&net2);
+               PeerManager_process_events(&net1);
+
+               LDK::EventsProvider ev1 = ChannelManager_as_EventsProvider(&cm1);
+               LDK::EventHandler evh1 = InvoicePayer_as_EventHandler(&payer);
+               ev1.process_pending_events(std::move(evh1));
+       }
+       assert(queue1.events.size() == 2);
+       assert(queue1.events[0]->tag == LDKEvent_PaymentSent);
+       assert(queue1.events[1]->tag == LDKEvent_PaymentPathSuccessful);
+
        // Actually close the channel
        num_txs_broadcasted = 0;
-       close_res = ChannelManager_close_channel(&cm1, &chan_id);
+       close_res = ChannelManager_close_channel(&cm1, &chan_id, ChannelManager_get_our_node_id(&cm2));
        assert(close_res->result_ok);
        PeerManager_process_events(&net1);
        while (num_txs_broadcasted != 2) {
@@ -723,10 +977,12 @@ int main() {
 
        conn.stop();
 
+       assert(peer_2_custom_messages.msgs.size() != 0);
+
        // Few extra random tests:
        LDKSecretKey sk;
        memset(&sk, 42, 32);
        LDKThirtyTwoBytes kdiv_params;
        memset(&kdiv_params, 43, 32);
-       LDK::InMemorySigner signer = InMemorySigner_new(sk, sk, sk, sk, sk, random_bytes, 42, kdiv_params);
+       LDK::InMemorySigner signer = InMemorySigner_new(sk, sk, sk, sk, sk, sk, random_bytes, 42, kdiv_params);
 }